benchmark updates: hermetic-sandbox doesn't matter
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Motiejus Jakštys
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README.md
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README.md
@ -8,55 +8,93 @@ The test
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--------
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Compiles 64 small binaries with [bazel-zig-cc][1] and [llvm14][2]. The tests
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were run on an x86_64 8-core machine running Ubuntu 22.04.
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were run on an x86_64 8-core machine running Ubuntu 22.04. The llvm's sysroot
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is this:
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Steps to reproduce
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------------------
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sha256 = "84656a6df544ecef62169cfe3ab6e41bb4346a62d3ba2a045dc5a0a2ecea94a3",
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urls = ["https://commondatastorage.googleapis.com/chrome-linux-sysroot/toolchain/2202c161310ffde63729f29d27fe7bb24a0bc540/debian_stretch_amd64_sysroot.tar.xz"],
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Baseline is llvm14: 12-13 seconds:
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... but with extra ~8k files, so the number of files in the sysroot is exactly
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the same as in zig sdk.
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```
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bazel --batch clean; bazel --batch build --extra_toolchains=@llvm_toolchain//:cc-toolchain-x86_64-linux ...
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INFO: Elapsed time: 12.454s, Critical Path: 1.11s
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```
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Baseline
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--------
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zig cc without the sandbox. Which means different invocations of `zig cc` will
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see that all files in `zig_lib_dir` are the same file. 17 seconds:
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Baseline llvm14 without sandbox: 12 seconds:
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```
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bazel --batch clean; bazel --batch build --spawn_strategy=local --platforms=@zig_sdk//libc_aware/platform:linux_amd64_gnu.2.28 ...
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INFO: Elapsed time: 17.021s, Critical Path: 1.67s
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```
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bazel build --extra_toolchains=@llvm_toolchain_with_sysroot//:cc-toolchain-x86_64-linux //:zigzag-0
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bazel clean; bazel shutdown
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bazel --batch build --spawn_strategy=local --extra_toolchains=@llvm_toolchain_with_sysroot//:cc-toolchain-x86_64-linux ...
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INFO: Elapsed time: 11.971s, Critical Path: 0.41s
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zig cc plain: 61 seconds. Sandbox is on a real disk, which means it will take
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even longer to re-hash all its dependencies:
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zig cc without the sandbox. 15 seconds:
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```
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bazel --batch clean; bazel --batch build --platforms=@zig_sdk//libc_aware/platform:linux_amd64_gnu.2.28 ...
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INFO: Elapsed time: 61.128s, Critical Path: 8.35s
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```
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bazel build --spawn_strategy=local --platforms=@zig_sdk//libc_aware/platform:linux_amd64_gnu.2.28 //:zigzag-0
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bazel clean; bazel shutdown
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bazel --batch build --spawn_strategy=local --platforms=@zig_sdk//libc_aware/platform:linux_amd64_gnu.2.28 ...
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INFO: Elapsed time: 15.631s, Critical Path: 1.99s
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zig cc with hardlinks: `--config=hermetic-sandbox`. This uses hardlinks to
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zig_sdk instead of symlinks:
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Cost of Sandbox
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---------------
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```
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bazel --batch clean; bazel --batch build --config=hermetic-sandbox --platforms=@zig_sdk//libc_aware/platform:linux_amd64_gnu.2.28 ...
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INFO: Elapsed time: 45.886s, Critical Path: 9.56s
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```
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llvm 14:
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llvm with sysroot (this sysroot is about half the size of zig):
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bazel build --extra_toolchains=@llvm_toolchain_with_sysroot//:cc-toolchain-x86_64-linux //:zigzag-0
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bazel clean; bazel shutdown
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bazel --batch build --extra_toolchains=@llvm_toolchain_with_sysroot//:cc-toolchain-x86_64-linux ...
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INFO: Elapsed time: 109.677s, Critical Path: 13.60s
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zig cc:
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bazel build --platforms=@zig_sdk//libc_aware/platform:linux_amd64_gnu.2.28 //:zigzag-0
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bazel clean; bazel shutdown
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bazel --batch build --platforms=@zig_sdk//libc_aware/platform:linux_amd64_gnu.2.28 ...
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INFO: Elapsed time: 116.370s, Critical Path: 16.23s
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Possible mitigation: Sandboxfs
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------------------------------
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No dice.
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llvm 14:
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bazel build --experimental_sandboxfs_path=sandboxfs --extra_toolchains=@llvm_toolchain_with_sysroot//:cc-toolchain-x86_64-linux //:zigzag-0
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bazel clean; bazel shutdown
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bazel --batch build --experimental_sandboxfs_path=sandboxfs --extra_toolchains=@llvm_toolchain_with_sysroot//:cc-toolchain-x86_64-linux ...
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INFO: Elapsed time: 96.803s, Critical Path: 12.42s
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zig cc:
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bazel build --experimental_sandboxfs_path=sandboxfs --platforms=@zig_sdk//libc_aware/platform:linux_amd64_gnu.2.28 //:zigzag-0
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bazel clean; bazel shutdown
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bazel --batch build --experimental_sandboxfs_path=sandboxfs --platforms=@zig_sdk//libc_aware/platform:linux_amd64_gnu.2.28 ...
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INFO: Elapsed time: 109.347s, Critical Path: 13.94s
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Possible mitigation: `--experimental_reuse_sandbox_directories`
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---------------------------------------------------------------
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Dice.
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llvm 14:
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bazel build --experimental_reuse_sandbox_directories --extra_toolchains=@llvm_toolchain_with_sysroot//:cc-toolchain-x86_64-linux //:zigzag-0
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bazel clean; bazel shutdown
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bazel --batch build --experimental_reuse_sandbox_directories --extra_toolchains=@llvm_toolchain_with_sysroot//:cc-toolchain-x86_64-linux ...
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INFO: Elapsed time: 25.252s, Critical Path: 4.44s
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zig cc:
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bazel build --experimental_reuse_sandbox_directories --platforms=@zig_sdk//libc_aware/platform:linux_amd64_gnu.2.28 //:zigzag-0
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bazel clean; bazel shutdown
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bazel --batch build --experimental_reuse_sandbox_directories --platforms=@zig_sdk//libc_aware/platform:linux_amd64_gnu.2.28 ...
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INFO: Elapsed time: 29.132s, Critical Path: 3.88s
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```
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bazel --batch clean; bazel --batch build --config=hermetic-sandbox --extra_toolchains=@llvm_toolchain_with_sysroot//:cc-toolchain-x86_64-linux ...
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INFO: Elapsed time: 25.644s, Critical Path: 3.03s
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```
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Flame graphs and discussion
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---------------------------
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Flame graphs are in results/. As of 2022-12-11 most of the overhead comes from
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creating and deleting the sandboxes. Time for a new sandboxfs!
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Flame graphs and more tests are in results/. As of 2022-12-11 most of the
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overhead comes from creating and deleting the sandboxes.
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[1]: https://sr.ht/~motiejus/bazel-zig-cc
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[2]: https://github.com/grailbio/bazel-toolchain
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@ -1,6 +1,6 @@
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load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
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## LLVM-14
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## LLVM
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BAZEL_TOOLCHAIN_TAG = "0.7.2"
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BAZEL_TOOLCHAIN_SHA = "f7aa8e59c9d3cafde6edb372d9bd25fb4ee7293ab20b916d867cd0baaa642529"
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@ -37,8 +37,8 @@ filegroup(
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visibility = ["//visibility:public"],
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)
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""",
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sha256 = "84656a6df544ecef62169cfe3ab6e41bb4346a62d3ba2a045dc5a0a2ecea94a3",
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urls = ["https://commondatastorage.googleapis.com/chrome-linux-sysroot/toolchain/2202c161310ffde63729f29d27fe7bb24a0bc540/debian_stretch_amd64_sysroot.tar.xz"],
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sha256 = "4498fa8ce2df8830afd88e0bbf7c8d353a13c3f2454abc507a057889075af904",
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urls = ["https://dl.jakstys.lt/zig/debian_stretch_amd64_sysroot-padding15353.tar.xz"],
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)
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llvm_toolchain(
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@ -5,24 +5,17 @@ _build() {
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name=$1
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shift
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bazel build --color=no --curses=no "$@" //:zigzag-0
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bazel shutdown
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bazel --batch clean --color=no --curses=no
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bazel clean --color=no --curses=no
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bazel shutdown --color=no --curses=no
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perf record --call-graph=dwarf -g -o "$HOME/$name.data" bazel --batch build --color=no --curses=no "$@" ...
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}
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_build zigcc-hermetic-j1 --jobs=1 --platforms=@zig_sdk//libc_aware/platform:linux_amd64_gnu.2.28 --config=hermetic-sandbox
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_build zigcc-hermetic-j8 --jobs=8 --platforms=@zig_sdk//libc_aware/platform:linux_amd64_gnu.2.28 --config=hermetic-sandbox
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_build llvm-hermetic-j1 --jobs=1 --extra_toolchains=@llvm_toolchain//:cc-toolchain-x86_64-linux --config=hermetic-sandbox
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_build llvm-hermetic-j8 --jobs=8 --extra_toolchains=@llvm_toolchain//:cc-toolchain-x86_64-linux --config=hermetic-sandbox
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_build llvm-sysroot-hermetic-j1 --jobs=1 --platforms=@zig_sdk//libc_aware/platform:linux_amd64_gnu.2.28 --config=hermetic-sandbox
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_build llvm-sysroot-hermetic-j8 --jobs=8 --platforms=@zig_sdk//libc_aware/platform:linux_amd64_gnu.2.28 --config=hermetic-sandbox
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_build zigcc-j1 --jobs=1 --platforms=@zig_sdk//libc_aware/platform:linux_amd64_gnu.2.28
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_build zigcc-j8 --jobs=8 --platforms=@zig_sdk//libc_aware/platform:linux_amd64_gnu.2.28
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_build llvm-j1 --jobs=1 --extra_toolchains=@llvm_toolchain//:cc-toolchain-x86_64-linux
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_build llvm-j8 --jobs=8 --extra_toolchains=@llvm_toolchain//:cc-toolchain-x86_64-linux
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_build llvm-sysroot-j1 --jobs=1 --platforms=@zig_sdk//libc_aware/platform:linux_amd64_gnu.2.28
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_build llvm-sysroot-j8 --jobs=8 --platforms=@zig_sdk//libc_aware/platform:linux_amd64_gnu.2.28
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_build zigcc-nosandbox --spawn_strategy=local --platforms=@zig_sdk//libc_aware/platform:linux_amd64_gnu.2.28
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_build llvm-nosandbox --spawn_strategy=local --extra_toolchains=@llvm_toolchain_with_sysroot//:cc-toolchain-x86_64-linux
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_build zigcc --platforms=@zig_sdk//libc_aware/platform:linux_amd64_gnu.2.28
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_build llvm --extra_toolchains=@llvm_toolchain_with_sysroot//:cc-toolchain-x86_64-linux
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_build zigcc-reuse-sandbox-dirs --experimental_reuse_sandbox_directories --platforms=@zig_sdk//libc_aware/platform:linux_amd64_gnu.2.28
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_build llvm-reuse-sandbox-dirs --experimental_reuse_sandbox_directories --extra_toolchains=@llvm_toolchain_with_sysroot//:cc-toolchain-x86_64-linux
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for d in $HOME/*.data; do
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f=$(basename "$d")
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